Carbureter.



A. D. CHANDLER.

CAHBURETER. APPLICATION FILED ocr. 4. :915.

Patented Jan. 7, 1919 2 SHEETS-SHEET l.

ffl-077.695

A. D. CHANDLER.

CARBUHETER.' APPLICATION FILED OCT. 4. 19|5.

2 SHEETS-SHEET 2.

Wijn/65565.-

Jz ven/Z0?" MM? /yu/z; a j?. imizdZer am.' y MMM Y ad? @fior/26%? Patented Jan. 7, 1919.

- -Unrrjinsrafrus rafrnnf FFXCE.

Aem-Isa fr. ."cnanntnns calorico,y naar, ois...

ration and conte plates an improvedfcar- 4bureter for association with internalv com bustion engines. y i

It is the object of my invention to'l pro- -vide a carbureter that is durable, capable of being. cheaply constructed, and one wherein the most efficient mixtures,v are produced and supplied to the engine for the various en# gine speeds. In the operation of my hereinafter described carbureter the constituent proportions of the combustible mixture supplied to the internal combustion engine with which the earbureter is associated are determined, maintained and graded automatically. and without adjustment other than that neo- 'essary preliminarily.

The carbureter of my invention adords a number of advantages among which may well be mentioned the fact that the carbureter is capable of automatically adapting itself to the requirements of its associated engine and thus supply the proper mixture to the engine for all speeds thereof and so does away with clicking the engine by loading it with a too rich mixture as is often the case when ordinary carbureters are used, when with the engine throttle down the throttle valve is rather suddenly opened to a greater or less extent.

A further important advantage of the carbureter of my .invention resides in the fact that under running conditions a comparativelyv low vacuum of small range is maintained within the engine manifold and carbureter mixing chamber. Due to Athis fact each of the engine pistons during almost the entire length .of each of its suction strokes serves to draw combustible mixture .carbureters .of the prior art are used a conv-slderable portion of the suctiony stroke ofv each engine piston is utilized to reduce the i"Appn'cati-on,aieafoctoberfiai915.; ser'iaiiifioariasse.-

pressure'withinfits associated cylinder to a degree less than the-pressure in the manifold and ea-rbureter andv thus but a comparatively small portion ofeach piston suction stroke is utilized'to. ldraw combustible mixture into ther'entgi-nei-licylinder. When my improved carburct'er is mad'euse 0f this disadvantage inherent the prior art carbureters is obviated;y

Inljfso assiV the present embodiment of my Ain'vention'fis concerned the abovementioned and other advantages to be hereinafter enumerated are obtained by a construction wherein* all'of the moving parts `with the exception of the springv pressed auxiliary air valve are mechanically connected with the manually operated throttle and are v operated synchronously therewith.

My invention is illustrated in the accompanying drawings wherein,

Figure l is a top plan view of my imaproved carbureter.

Fig. 2 is a view'partly in section and partly in elevation taken on a vertical plane through the line 2--2 of Fig. l and looking in the direction indicated by thea arrows.

Y Fig. 8 is a vertical sectional View taken on the line 8 3 of Fig. 1 and looking in the direction indicated by the arrows ;4 and Fig. l is an isolated detail view in section of the auxiliary air valve taken on the line 4-4 of.-Fig. l and looking in the di rection indicated by the arrows. Y

Similar characters ofl reference refer to similar parts throughout the several views. rlhe carbureter casing is illustrated at 5 and it will be seen that it provides a car-v bureting chamber 6 with which communi- Cates a main air inlet passage 7 and a miX- ture outlet at 8. A flange 9 encircles the .outlet 8 so that the carbureter may be at# tached to the manifold 10 of an internal combustion Iengine in the usual manner. The casing 5 is conformed to provide a seat for the upper edge of a cup 11 which is retained in position by a nut 12threaded. upon the lower end of the downwardly eX- tending portion 5 of the carbureter casing. It will be seen that the cup 11- is disposed co-aXially with the carbureting chamber 6 and that the aforesaid cup ll constitutes a constant level fuel chamber, commonly known as the float chamber. illustrated at 13, which in the present embodiment of my invention is ofthe annular` type, coperates with mechanism of any suitable construction (not shown) to maintain the liquid fuel lwithin the float chamber at a substantially constant level in a well known manner.

14 `and the oat chamber is regulated by` means of a needle valve 16 which, at its upper end has threaded engagement with of thesl the cap 17 of the carbureting chamber 6 and is, moreover, provided with a knurled hand piece 18 to facilitate adjustment of the needle valve. The lower end of the needle valve 146 extends through a sleeve 19 sup ported through a spider from the lining 20 ,of the puddle chamber 14. It will be seen that the lower end of the sleeve 19 terminates in the puddle chamber 14 below the normal lever of 'the fuel within the float chamber and that inasmuch as there ,is an annular space betweenthe sleeve 19 and the needle vvalve the sleeve 19 under certain operating conditions serves to provide a conduit for liquid fuel from the puddle chamber 14.

Suspended in the carbureting chamber 6, and conveniently retained in position by a split ring 21 coperating with a groove in the wall of the carbureting chamber is the venturi 22.

' As thus far described the present embodiment of my invention does not differ in any inaterial respect from the ordinary puddle carbureter commonly in use and with which all persons skilled in the art of carburation are familiar. 1t will be under stood, therefore, that numerous changes may be r .de in the detailed construction e tures of the carbureter at the same time securing the mode of operation and result which characterize my present invention.

Disposed in the mixture outlet 8 at a point somewhat removed from the Hai-ige 9H is a throttle in the form of a butte y valve 23 mounted upon a shaft 23. journaled in the carbureter casing 5, as ismost clearly illustrated in Fig. 3. Fixed with respcct to the upper end of the shaft 23 are 'the three arms 24, 25, and 26. The arm 24 serves as a crank arranged to be connected with the usual controlling rod whereby the position of the throttle vulve 3 may bc manually controlled from any convenient point, as, for instance, the steer;

ing column or dash of an automobile of which the carbureter and its associated engine form a part. The arm 25 is provided with an adjustable' screw 27 which engages a lug 28 formed on the cap 17 of the carbureting chamber when the throttle valve 23 is in closed position. Disposed Within the air inlet passage 7 is a butterfly valve 29 mounted upon a shaft 30 journaled in the carbureter casing, the upper end of said shaft 30 having attached thereto a lever 31 .the free end of which is connected through a link 32 with the Jfree end of the arm 26which, as has been previously explained, has the other end thereof fixed with respect 'to the `upper end 'of the shaft 23 uponwhich the butteriiyvalve 23, or thrott1e,'is

mounted. The connection between the but-y formed integral therewith a spider'and a.

sleeve 35a through which extends the stem upper end of the stem 36 is a nut 37 for adjusting the tension of the spring 38 which -36 of the puppet valve. Threaded upon the normally retains the valve 34 in seated position. It will be understood that thevalve 34 may be of any conventional construction and need not necessarily be of the precise type illustrated in the drawing. The outlet end of the conduit 33 for auxiliary air .terminates in the mixture outlet paage Y8 at a point intermediate the buttery or throttle valve 23 and the engine manifold.

It will, therefore, be seen that the opera--v tion of the puppet valve 34 is wholly controlled by the partial vacuum crea-ted within the engine manifold and that the operation of the valve 34 is unaected by the throttle valve 23 except in so far as Ithe position of the throttle valve 23. aiects the. pressure within the engine manifold. The response ofthe auxiliary air .valve 34 to l'tial .vacuums created within the mani old is regulated and determined by a butterfly valve 39 mounted upon a shaft 40 and located in the conduit 33 at. a point intermediate the auxiliary air valve 34 and the mixture outlet 8. Fixed to the upper end of the valve shaft 40, as is most clearly illustinted in Fig. 1. is a level' 41 connected by a link 42 with the arm 26 which, as has been previously pointed out, is fixed with .respectv to the shaft 23 upon which the butmenace terfly throttle valve 23 is mounted. fllhe arrangement is such that the butterdy valve 39 is operated simultaneously with the' throttle ,valve 23 in substantially the same manner as -is the bnttery valve 29 located in the air inlet passage ih.

As most clearly illust-rated in TFigs. i and 2, a passage t3 is formed in the carburetor casing-,this passage leading .trom the puddle chamber la below the normal. fuel level therein to the mixture outlet passage il at a point intermediate the throttle value 23 and the engine manifold. llt will he unclestood that this passage Il?) serves 'to permit the 'passage of fuel from the puddle chamber 14 to the mixtureioutlet 8 during' the operation of starting the engine in order to atorcl the rich mixture necessary tothe starting operation. A

l find that hy: providing the arrangement previously' described a comparatively low `vacuum of comparatively small range is v maintained within the carbureting chamber 6 and the Venturi tube during'noinal running conditions,the auxiliary air valve 34 beingadjusted to respond to. admit auxiliary air when the engine speeds up and thus tends to increase the vacuum 'within the engine manifold and the barburetinp; chamber, The fact that a low .and substantially conetant Vacuum is maintained within the engine manifold L)and earbureting chamber l during' ordinary running conditions is .a matter of considerable importance, as has@ 'been `previously pointed out, inasmuch as when this'condition exists greater compression,l with a consequent increase in power developed by the associated engine, is assured. y

llt will be eeen that-the butterdy valve 39 serves to prevent what might otherwise be the eiiject of the air valve 34 at low engineV speeds. i maypoint out at this time that l nud the` butterfly valve 39 may in some cases i be arranged to close slightly before the throt-` tlovalveQBis closed, this arrangement being for the purpose of permittingr the engine t0 be readily started, but the difference in the position ot' the two valves in such a, case is so slight that the operation ot' the carburetcr'is identical at. the higheicngine speeds with thc. operation of---thecarburetor when all ot' the butterfly valves are simultaneously opened and closed. 4

As has. been previously pointed out., the. carlnircter construction herein described successfully prcycnts thc origine trom being ,loadedl with a too rich mixture in case the throttle valve be quickly movcd from nearly closcfl position to fullyopcn or nearly fully open position. lf it-wc|'c not t'br thc novel arrangement which l provide t'or supplying tho curburctcr witli auxiliary nir thc lcndcncy in such u cusc n'ouhl lie-lo supply the engincwith a very rich mixture in a a passage leading from the puddle considerable quantity. lt the engine insuoh case were t0 be running at comparatively low speed when the throttle was thus suddenly opened the engine would be unable to handle the large quantity of rich mixture and would become overloaded with mixture and choke, as l have previously pointed out.

Having thus'described the carburetor ofv termediate the throttle valve and the engine,

a check valve controlling the admission oit air to said auxiliary air inlet, avalve in the nist-mentioned air inlet'. devices or'insur ing the simultaneous and similar operation of said last-inentioned Valve and saidthrot tle valve, and means mechanically connected with saidnthrottle valve or limiting the admission air through said check, valve.

` 2. in combination with a. Acarhtnetingg1 chamber having an air inlet and a mixture outlet arranged to he connected with an engine, a throttle Valve in said mixture outlet, an auxiliary air inlet communicating with the mixture outlet intermediate the' throttle valve and the engine. a check valve oontrolling the admission of air to said auilia-ry nir inlet. a valve in the auxiliary air inletI controllingr communication with the mixture. outlet, and devices for insuringlr simultaneous and simi-lar operation of said' last-men# tioned valve and said throttle valve.

3. In combination with a carbiueting-` chamber haring an aliinlet and a mixture outlct,a constant level fuel supply cliamber,

u puddle in the carbureting chamber communicating with the fuel supplychamber, a throttle 'alve in the miitureaoutlez `a nas-l sagc leading from the puddle to the mixture outlet/at a point intermediate the throttle and the enggine.l an auxiliary air inlet e0m.

municating with the mixture outlet intery q 5115 mediate the throttle and the engineq a ,check valve controlling the admission of air to said auxilinry'itir inletn a inunnally operable valve in thc tirst-mentioned air inlet. a mau-Y nally operable valve iu the auxiliary air inlct. controlling communication owith the mixture outlet. and means 'tor operatingsaidmanuallyoperable valves simultaneously -with the throttle valve.

l. ln combination with a carbureting chamber hz'wingy an air inlet and a mixture outlet. a constant. level fuel supply chamber.' a puddle in the carbureting chamber communicating with the t'nol supply Achamhcr. a throttle valve in the mixture outlet, to the i mixture outlet at a point intermediate the throttle and the engine, an auxiliary air Ait) inlet communicating Wtih the mixture outlet intermediate the throttle and the engine,

air to said auxiliary air inlet, a' valve in the auxiliary air inlet controlling communicatlon with the mixture outlet, and means for operating vsaid last-mentioned valve simultaneously with and similarly to the throttle valve.

5. In a carbureter for internal combus- .tion engines, the combination with a car' bureting chamber having an air inlet, a combustible mixture outlet, a throttle valve a check valve controlling the admission of in the combustible mixture outlet, an auxi inthe mixture outlet', anauxiliary air inlet' communicating with thencomhustible mixture outlet intermediate 4the throttle, valvev and the engine, a normali l closed automatic valve at the intake end o said auxlliary air the mixture outlet, a valve in the air inlet, means for insuring similar and simultaneous operation of said'last-mentioned valve and said throttle valve, an auxiliary air inlet communicating with the mixture outlet intermediate the throttle, valve and the associated engine, automatic means for regulating the supply of air through said auxiliary air inlet, and means operably connected with said throttle valve for regulating the supply of air through said auxiliary air inlet.

8. In a carbureter the combination with a .carbureting chamber having an air inlet and a mixture outlet arranged to 1-he con? nected with an engine, a throttle valve in the mixture outlet, an auxiliary air inlet passage communicating with the mixture outlet intermediate the throttle andthe engine, a valve in the auxiliary air'inlet'pa sage, devices connecting said last'mentione valve and said throttle valve whereby said valves are operated from the same operating mechanism, and 'an inwardly `opening check valve said auxiliary airA inlet pas- An inlet A{levies},auf the specified class, comprising unfair conduit, a compensating Valve therein, aI throttle between theconr pensating valve land the intake manifold, a throttlefbetween ,the source of gas sup.-

`ply and the manifold, and means for coninlet, an adjustable butterfly valve located in said auxiliary airinlet, and mechanism connected with said throttle valve `for ad- `justingg,l said butterfiy valve.

7. in a catturate., ne @intimement -a carbureting chamber having an air inlet and a mixture outlet, ci a throttle valve in nectingand operating the throttles together.

ln Witness whereof, I hereunto subscribe .mj name this 2nd day of October, A. D.

AQUILA. D. CHANDLER. Witnesses:

A. Gf. MoCALnB, ALBIA C. AHLBERG. 

